RunRyder RC
WATCH
 1 page 605 views Post Reply
Home✈️Aircraft🚁Helicoptere-AlignOther › Rex has the shakes
07-23-2006 12:21 AM  14 years ago
Topic Vote0Post 1
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic
Rex has the shakes
Okay this is new to me. I flew a blade cp for quite awhile and when I had problems it was almost always due to a crash and I could figure what I had done and fix it.

I now am flying a Trex 450xl everyday and it has been working just great. So great in fact that I have over 100 flights with no crashes but now I must have worn something out. It has developed a sizable vibration or shake at a couple hundred rpms, before liftoff speed. I am running jgf 450th and align 35a esc and 315 pro blades, which I just rechecked the balance. The only crash I know of was the first day I got it I didn't take enough time to learn how much different it was then my blade.

I don't notice the shake as much when spooling down. It shouldn't be the main shaft or feathering spindle, no crash, no real hard landing, no nothing but sport flying.

Thanks
Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 12:30 AM  14 years ago
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic

What should I do to start looking for my source of shaking?

Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 12:43 AM  14 years ago
Yug

rrMaster

UK. Herts

MyPosts All Forum Topic
Most helis do shake as they are spooling up until the blades settle down. If you've not crashed it, then it could be wear on dampers or bad bearings. Yoe may have inadvertently bent the spindle. Also check to see if any screws are coming loose and that all links are sized OK.Vegetable rights and Peace
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-23-2006 12:44 AM  14 years ago
Gyronut

rrProfessor

Martinsville In.

MyPosts All Forum Topic
Its nearly impossible to diagnose the problem based on the available info.

Do you have a high point balancer...??? They are invaluable for finding out of balance items.

What sort of shake do you have..??
Rick
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-23-2006 01:08 AM  14 years ago
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic
Thanks Willy,

I think that makes sense, remove most possibilities and start adding back till I find the problem. I had not thought of it being the tail, but I am seeing signs of a lot of wear and shedding on the belt which I suppose could be messing up the tail.

I may replace the belt first since I do see wear there and then if it is still shaking tear down and eliminate one thing at a time.
Do you have a high point balancer...???
I do not know what A high point balancer is.
What sort of shake do you have..??
Looking down on the Main shaft I see a wobble at low end rpms, enough to shake the whole heli and almost rock it back and forth on the landing gear. Much more then is normal shaking for a heli.


Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 01:11 AM  14 years ago
Yug

rrMaster

UK. Herts

MyPosts All Forum Topic
If you remove the main blades do you still see the wobble ?Vegetable rights and Peace
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-23-2006 01:28 AM  14 years ago
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic
If you remove the main blades do you still see the wobble
Yes, not as much with the weight of the blades gone but still a definite shake.

Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 01:51 AM  14 years ago
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic
Just pulled the main shaft and it is slightly bent, I put it on a square and rolled it while looking at a flourecent light and could see light under the middle then when rolled the ends would rock. This is a small amount of bend, could it cause the whole thing to shake?

Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 01:53 AM  14 years ago
Yug

rrMaster

UK. Herts

MyPosts All Forum Topic
yes. replace it.Vegetable rights and Peace
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-23-2006 03:07 AM  14 years ago
vsnyder8

rrVeteran

Ft Wayne, IN

MyPosts All Forum Topic
I can't believe that small of a bend can cause that much shaking. But with a new main shaft I see very little shaking now, what I consider normal.

The other thing I don't understand is how it got bent, maybe the other day when I was turning and the wind got under the blade and caused a seconds panic and I had to hit full throttle to keep from going down. Could that put enough binding action to bend the steel shaft?

Well anyhow, I want to thank you guys for helping, sometimes it is easy to miss the obvious first step when it is my own problem.

Thanks, fly's great again.

Van
AMA Member # 907855
SHARE  PM  EMAIL  Attn:RR  Quote
07-23-2006 03:39 AM  14 years ago
MikeInMobile

rrElite Veteran

Mobile, Alabama

MyPosts All Forum Topic
Yes, that will bend the shaft. The Align shafts are made from a low grade of steel, and are not hardened. They are easy to bend!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 605 views Post Reply
Home✈️Aircraft🚁Helicoptere-AlignOther › Rex has the shakes
Print TOPIC

 3  Topic Subscribe

Friday, June 18 - 9:38 pm - Copyright © 2000-2021 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online